uses crt;
var a:array[1..9,1..7] of integer;
n,m,i,j,k:byte;
x:integer;
begin
clrscr;
randomize;
n:=8;
m:=7;
writeln('Исходный массив:');
for i:=1 to n do
begin
for j:=1 to m do
begin
a[i,j]:=random(20)-10;
write(a[i,j]:4);
end;
writeln;
end;
write('Press Enter...');
readln;
writeln('Замена элементов первых 3х столбцов их модулями:');
for i:=1 to n do
begin
for j:=1 to m do
begin
if j<=3 then a[i,j]:=abs(a[i,j]);
write(a[i,j]:4);
end;
writeln;
end;
write('Press Enter...');
readln;
writeln('Вставка второй строки в середину:');
n:=n+1;
for j:=1 to m do
for i:=n downto n div 2+2 do
a[i,j]:=a[i-1,j];
for j:=1 to 7 do
a[n div 2+1,j]:=a[2,j];
for i:=1 to n do
begin
for j:=1 to m do
write(a[i,j]:4);
writeln;
end;
write('Press Enter...');
readln;
j:=1;
while j<=m do
if a[2,j]>a[n,j] then
begin
for i:=1 to n do
for k:=j to m-1 do
a[i,k]:=a[i,k+1];
m:=m-1;
end
else j:=j+1;
writeln('Удаление столбцов где второй элемент больше последнего:');
for i:=1 to n do
begin
for j:=1 to m do
write(a[i,j]:4);
writeln;
end;
write('Press Enter...');
readln;
for j:=1 to m do
begin
x:=a[2,j];
a[2,j]:=a[n,j];
a[n,j]:=x;
end;
writeln('Обмен второй и последней строки:');
for i:=1 to n do
begin
for j:=1 to m do
write(a[i,j]:4);
writeln;
end;
write('Press Enter...');
readln
end.